Real life simultaneous Real life simultaneous equations problemsequations problems

Alaa Sharfi1/27/2012Algebra 2Ms. Rosanna

Links to websites that Links to websites that explain how to solve explain how to solve simultaneous equations bysimultaneous equations byGraphing:http://www.bbc.co.uk/schools/

gcsebitesize/maths/algebra/simultaneoushirev2.shtml

Elimination:http://www.teacherschoice.com.au/maths_library/algebra/alg_10.htm

Substitution:http://www.teacherschoice.com.au/Maths_Library/Algebra/Alg_9.htm

Videos to explain Videos to explain simultaneous equations simultaneous equations

Elimination:http://www.youtube.com/watch?v=XM7Q4Oj5OTc

Substitution:http://www.youtube.com/watch?v=8ockWpx2KKI

Graphing:http://www.youtube.com/watch?v=cqBwozd8nu8

Real life sReal life simultaneous imultaneous equations problem solved by equations problem solved by EliminationElimination

7 pizzas and 5 chicken sandwiches cost $155. 10 pizzas and 8 chicken sandwiches cost $230. Find the cost of one pizza and one chicken sandwich. P= Pizza & S= chicken sandwich.

7p+5s= 15510p+ 8s= 230

Multiply to get similar variables:8 X (7p+ 5s= 155) = 56p+ 40s = 12405 X(10p+8s= 230)= 50p + 40s =

1150

Since both s variables are positive we subtract the two equations.

56p + 40s = 1240-50p + 40s = 1150 6= 90 = 15 6 6

P=15

Real life sReal life simultaneous imultaneous equations problem solved equations problem solved by substitutionby substitution

Solve the following Solve the following questionquestionYou are looking to rent an apartment.

One costs $800 a month and has a $1000 deposit and the other costs $850 but has an $850 deposit. How long do you need to stay there before the first one is a better deal?